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Studies of η-Meson Two-Photon Production with the SND Detector at the e+e– Collider VEPP2000 e+e对撞机VEPP2000上SND探测器产生η介子双光子的研究
IF 0.4
Physics of Particles and Nuclei Letters Pub Date : 2025-04-23 DOI: 10.1134/S1547477124702066
M. N. Achasov, A. Yu. Barnyakov, K. I. Beloborodov, A. V. Berdyugin, D. E. Berkaev, A. G. Bogdanchikov, A. A. Botov, E. I. Grigoruk, T. V. Dimova, V. P. Druzhinin, V. N. Zhabin, L. V. Kardapoltsev, D. P. Kovrizhin, I. A. Koop, A. A. Korol, A. S. Kupich, A. P. Kryukov, N. A. Melnikova, N. Yu. Muchnoy, A. E. Obrazovsky, E. V. Pakhtusova, M. I. Petrova, K. V. Pugachev, Yu. A. Rogovsky, S. I. Serednyakov, Z. K. Silagadze, I. K. Surin, Yu. V. Usov, A. G. Kharlamov, Yu. M. Shatunov, V. D. Shrainer, D. A. Shtol
{"title":"Studies of η-Meson Two-Photon Production with the SND Detector at the e+e– Collider VEPP2000","authors":"M. N. Achasov,&nbsp;A. Yu. Barnyakov,&nbsp;K. I. Beloborodov,&nbsp;A. V. Berdyugin,&nbsp;D. E. Berkaev,&nbsp;A. G. Bogdanchikov,&nbsp;A. A. Botov,&nbsp;E. I. Grigoruk,&nbsp;T. V. Dimova,&nbsp;V. P. Druzhinin,&nbsp;V. N. Zhabin,&nbsp;L. V. Kardapoltsev,&nbsp;D. P. Kovrizhin,&nbsp;I. A. Koop,&nbsp;A. A. Korol,&nbsp;A. S. Kupich,&nbsp;A. P. Kryukov,&nbsp;N. A. Melnikova,&nbsp;N. Yu. Muchnoy,&nbsp;A. E. Obrazovsky,&nbsp;E. V. Pakhtusova,&nbsp;M. I. Petrova,&nbsp;K. V. Pugachev,&nbsp;Yu. A. Rogovsky,&nbsp;S. I. Serednyakov,&nbsp;Z. K. Silagadze,&nbsp;I. K. Surin,&nbsp;Yu. V. Usov,&nbsp;A. G. Kharlamov,&nbsp;Yu. M. Shatunov,&nbsp;V. D. Shrainer,&nbsp;D. A. Shtol","doi":"10.1134/S1547477124702066","DOIUrl":"10.1134/S1547477124702066","url":null,"abstract":"<p>We present the preliminary measurement of the two-photon η-meson production cross section: <span>({{e}^{ + }}{{e}^{ - }} to {{e}^{ + }}{{e}^{ - }}eta (550))</span>. The measurements were carried out by the SND detector at the VEPP-2000 collider in the energy range from 1 to 2 GeV, the integral luminosity of the order of 0.5 fb<sup>–1</sup> was used. The η-meson was detected at the six-photon final state, without scattered electrons registration. From the cross section of this process, we extract the two-photon η-meson width. The experimental results obtained can be used to calculate the hadronic contribution to the light by light scattering and to interpret the results of the muon anomalous magnetic moment measurement’s and to calculate the electromagnetic interaction constant at Z boson mass scale.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 1","pages":"181 - 186"},"PeriodicalIF":0.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hydrodynamic Calculations and Bench Tests of the Cooling System of ADC64ECal Electronics in the Leakless Mode ADC64ECal电子设备无泄漏冷却系统的流体力学计算与台架试验
IF 0.4
Physics of Particles and Nuclei Letters Pub Date : 2025-04-23 DOI: 10.1134/S1547477124701851
I. A. Zur, A. S. Fedotov, Yu. V. Shafarevich, M. A. Medvedeva, A. A. Shish, Yu. A. Fedotova, I. A. Balashov, A. A. Makarov, G. V. Meshcheryakov, S. N. Bazylev, A. V. Terletskii, A. Yu. Dubrovin
{"title":"Hydrodynamic Calculations and Bench Tests of the Cooling System of ADC64ECal Electronics in the Leakless Mode","authors":"I. A. Zur,&nbsp;A. S. Fedotov,&nbsp;Yu. V. Shafarevich,&nbsp;M. A. Medvedeva,&nbsp;A. A. Shish,&nbsp;Yu. A. Fedotova,&nbsp;I. A. Balashov,&nbsp;A. A. Makarov,&nbsp;G. V. Meshcheryakov,&nbsp;S. N. Bazylev,&nbsp;A. V. Terletskii,&nbsp;A. Yu. Dubrovin","doi":"10.1134/S1547477124701851","DOIUrl":"10.1134/S1547477124701851","url":null,"abstract":"<p>In this paper, an approach to the analysis of hydraulic characteristics for the cooling and thermal stabilization systems of subdetectors in the MPD setup is described, including mathematical modeling and bench tests. Distributed and discrete models are used to simulate the cooling fluid flow. For bench tests, an automated test bench representing a software–hardware complex with vacuum and circulation pumps and liquid pressure, liquid flow rate, and temperature sensors has been developed. The test bench design may be transformed in compliance with formulated test problems. It has been experimentally established that, at a nominal cooling fluid flow rate of 0.006 kg/s, the pressure drop on one cooling pipeline of ADC64ECal modules is ≈0.12 atm. Numerical calculation and experimental measurement results for the pressure drop agree with each other with a deviation less than 2%. The transition to the leakless mode (absolute pressure, 0.4–0.0 atm) does not change the pressure–flow rate characteristic of the ECal panel when compared to the regime of flow at a superatmospheric pressure. The proposed approach is applicable to a broad spectrum of problems on the characterization and commissioning of the thermal stabilization and cooling system of the ТРС detector and other MPD setup detectors.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 1","pages":"45 - 53"},"PeriodicalIF":0.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Preliminary Computations for the Pulsed Reactor IBR-4. Optimization of the Neutron Flux 脉冲堆IBR-4的初步计算。中子通量的优化
IF 0.4
Physics of Particles and Nuclei Letters Pub Date : 2025-04-23 DOI: 10.1134/S1547477124701863
Yu. N. Pepelyshev, A. V. Vinogradov, A. D. Rogov, D. Sumkhuu
{"title":"Preliminary Computations for the Pulsed Reactor IBR-4. Optimization of the Neutron Flux","authors":"Yu. N. Pepelyshev,&nbsp;A. V. Vinogradov,&nbsp;A. D. Rogov,&nbsp;D. Sumkhuu","doi":"10.1134/S1547477124701863","DOIUrl":"10.1134/S1547477124701863","url":null,"abstract":"<p>The IBR-4 pulsed reactor with a power of 4 MW and a pulse repetition frequency of 10 1/s is considered as a pulsed neutron source to replace the IBR-2M reactor, which will be decommissioned by the end of the 2030s. The IBR-4 design is based on the MBIR reactor implementing the principles of continuity of succesful solutions used in the IBR-2 and IBR-2M reactors. The IBR-4 core ensures the nuclear safety of the reactor and minimizes low-frequency fluctuations in pulse energy. The IBR-4 design is a development of the basic design of the core with the addition of beryllium reflectors and small-volume water moderators. The IBR-4 reactor makes it possible to obtain thermal neutron flux densities on the surface of the water moderator for the extracted neutron beams at a level of 1.2 × 10<sup>14</sup> n/(cm<sup>2</sup> s), and, in the region close to the surface of the moderator, 3.0 × 10<sup>14</sup> n/(cm<sup>2</sup> s). Thus, IBR-4 is a powerful pulsed source of thermal neutrons.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 1","pages":"54 - 68"},"PeriodicalIF":0.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of Short-Range Rapidity Correlations on Multiplicity Fluctuations 短程快速性相关对多重波动的影响
IF 0.4
Physics of Particles and Nuclei Letters Pub Date : 2025-04-23 DOI: 10.1134/S1547477124702091
V. V. Vechernin, S. N. Belokurova
{"title":"Influence of Short-Range Rapidity Correlations on Multiplicity Fluctuations","authors":"V. V. Vechernin,&nbsp;S. N. Belokurova","doi":"10.1134/S1547477124702091","DOIUrl":"10.1134/S1547477124702091","url":null,"abstract":"<p>The influence of short-range rapidity correlations on the fluctuation of the number of charged particles in a given rapidity interval of observation is investigated. It is shown that for pp collisions at LHC energies, the fluctuations of the particle number from a given string cluster are, due to the presence of short-range correlations between particles, significantly larger than the Poisson ones. The value of the scaled and robust variance of the multiplicity for <i>pp</i> collisions is calculated at three initial energies: 0.9, 2.76, and 7 TeV, both with and without taking into account the processes of string fusion and formation of string clusters. A comparison with experimental data is performed and it is shown that the results obtained taking into account the formation of string clusters agree well with the experimental values, in contrast to the case where string fusion processes are not taken into account.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 1","pages":"194 - 198"},"PeriodicalIF":0.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Interpretation of Wave Function by Coherent Ensembles of Trajectories 用相干轨迹集合解释波函数
IF 0.4
Physics of Particles and Nuclei Letters Pub Date : 2025-04-23 DOI: 10.1134/S1547477124701826
V. V. Kisil
{"title":"Interpretation of Wave Function by Coherent Ensembles of Trajectories","authors":"V. V. Kisil","doi":"10.1134/S1547477124701826","DOIUrl":"10.1134/S1547477124701826","url":null,"abstract":"<p>We re-use some original ideas of de Broglie, Schrödiger, Dirac and Feynman to revise the ensemble interpretation of wave function in quantum mechanics. To this end we introduce coherence (auto-concordance) of ensembles of quantum trajectories in the space-time. The coherence condition accounts phases proportional to classical action, which are in foundation of the Feynman path integral technique. Therefore, our interpretation is entirely based on well-known and tested concepts and methods of wave mechanics. Similarly to other ensemble interpretations our approach allows us to avoid all problems and paradoxes related to wave function collapse during a measurement process. Another consequence is that no quantum computation or quantum cryptography method will ever work if it assumes that a particular q-bit represents the entire wave function.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 1","pages":"24 - 27"},"PeriodicalIF":0.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Erratum to: Study of the Modifying Effect of 1-β-D-Arabinofuranosyl Cytosine on the Immune Status of Rats in the Long Period under the Exposure to Protons 勘误1-β-D-阿拉伯呋喃糖基胞嘧啶对长期暴露于质子环境中的大鼠免疫状态的调节作用研究
IF 0.4
Physics of Particles and Nuclei Letters Pub Date : 2025-04-23 DOI: 10.1134/S1547477125010017
E. V. Pronskikh, I. A. Kolesnikova, Yu. S. Severiukhin, D. M. Utina, K. N. Golikova, T. S. Khramko, M. Lalkovičová, A. G. Molokanov
{"title":"Erratum to: Study of the Modifying Effect of 1-β-D-Arabinofuranosyl Cytosine on the Immune Status of Rats in the Long Period under the Exposure to Protons","authors":"E. V. Pronskikh,&nbsp;I. A. Kolesnikova,&nbsp;Yu. S. Severiukhin,&nbsp;D. M. Utina,&nbsp;K. N. Golikova,&nbsp;T. S. Khramko,&nbsp;M. Lalkovičová,&nbsp;A. G. Molokanov","doi":"10.1134/S1547477125010017","DOIUrl":"10.1134/S1547477125010017","url":null,"abstract":"","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 1","pages":"236 - 236"},"PeriodicalIF":0.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Diquarks for Large-p⊥-Baryon Production at High-Energy p–p Collisions 高能p-p碰撞中产生大p-p重子的重夸克
IF 0.4
Physics of Particles and Nuclei Letters Pub Date : 2025-04-23 DOI: 10.1134/S1547477124702121
V. T. Kim, A. V. Zelenov
{"title":"Diquarks for Large-p⊥-Baryon Production at High-Energy p–p Collisions","authors":"V. T. Kim,&nbsp;A. V. Zelenov","doi":"10.1134/S1547477124702121","DOIUrl":"10.1134/S1547477124702121","url":null,"abstract":"<p>Scalar diquark model of proton improved by parton intrinsic transverse momentum in hadrons is able to describe the strong scaling violation in proton production large transverse momentum <span>({{p}_{ bot }})</span> within perturbative QCD in a wide energy range: <span>(sqrt s = 11.5,,{text{GeV}})</span> at U70 (NRC KI—IHEP, Protvino), <span>(sqrt s = 23.4,,{text{GeV}})</span> at Tevatron (FNAL, Chicago), and <span>(sqrt s = 62,,{text{GeV}})</span> at ISR (CERN, Geneva) is presented. Estimates for the production of tetraquark exotic states formed by scalar diquarks in the SPD experiment at the forthcoming NICA collider (JINR, Dubna) have been obtained.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 1","pages":"213 - 218"},"PeriodicalIF":0.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Entropy for System with Structural Constituents 含结构成分系统的熵
IF 0.4
Physics of Particles and Nuclei Letters Pub Date : 2025-04-23 DOI: 10.1134/S1547477124702005
M. Tokarev, I. Zborovský
{"title":"Entropy for System with Structural Constituents","authors":"M. Tokarev,&nbsp;I. Zborovský","doi":"10.1134/S1547477124702005","DOIUrl":"10.1134/S1547477124702005","url":null,"abstract":"<p>The entropy of microscopic configurations accompanied hadron production in nucleus-nucleus collisions is discussed. It is expressed, in the <i>z</i>-scaling approach, via the momentum fractions of colliding particles and scattered constituents fragmented to produced particles, the structural and fragmentation fractal dimensions, the multiplicity density of negative particles and model parameter interpreted as a specific heat of nuclear medium. Principle of the maximal entropy with taking into account momentum conservation law for constituent sub-process is used to determine the momentum fractions and model parameters by requiring self-similarity of the function ψ in dependence on dimensionless variable <i>z</i>. Statistical interpretation of the entropy in terms ensemble of fractal configurations of internal structures of colliding hadrons and fractal configurations corresponding to a fragmentation process in the final state is given. A conservation law of a quantum cumulativity and quantization of fractal dimensions are formulated.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 1","pages":"151 - 155"},"PeriodicalIF":0.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Peculiarities of Regge Cuts in QCD QCD 中雷格切的特殊性
IF 0.4
Physics of Particles and Nuclei Letters Pub Date : 2025-04-23 DOI: 10.1134/S1547477124701942
V. S. Fadin
{"title":"Peculiarities of Regge Cuts in QCD","authors":"V. S. Fadin","doi":"10.1134/S1547477124701942","DOIUrl":"10.1134/S1547477124701942","url":null,"abstract":"<p>As is known from the classical theory of complex angular momenta, along with the Regge poles in the complex <i>j</i>-plane should be cuts that are generated by the poles. In QCD, the cuts are generated by exchanges of the Reggeized gluons, whose properties are strikingly different from the properties of Reggeons in classical theory, which leads to peculiarities of the formation of the cuts. The talk is devoted to the discussion of these peculiarities.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 1","pages":"117 - 125"},"PeriodicalIF":0.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Status of the MPD Experiment: Towards the First Data Taking MPD实验现状：迈向第一次数据采集
IF 0.4
Physics of Particles and Nuclei Letters Pub Date : 2025-04-23 DOI: 10.1134/S154747712470211X
V. Riabov
{"title":"Status of the MPD Experiment: Towards the First Data Taking","authors":"V. Riabov","doi":"10.1134/S154747712470211X","DOIUrl":"10.1134/S154747712470211X","url":null,"abstract":"<p>The Multi-Purpose Detector (MPD) is the main experiment of the NICA complex, which is currently under construction at JINR, Dubna. With collisions of heavy-ions in the collider and the fixed-target modes, the MPD detector will cover the energy range <span>(sqrt {{{s}_{{NN}}}} = 2.4- 11)</span> GeV to scan the high baryon-density region of the QCD phase diagram. The main physics objectives of the MPD experiment are to look for the Critical End-Point and the first order phase transition predicted to occur in that region. The commissioning of the MPD detector with cosmic rays and beams is expected to start in 2025. A rich physics program, that includes study of light hadron and (hyper)nuclei production, measurements of flow, correlations and fluctuations will be studied with the first collected data sets. In this paper, we review status of the MPD experiment and discuss its operation details with the first beams.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 1","pages":"207 - 212"},"PeriodicalIF":0.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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